I called back and constantly engaged

I called back number 0414 088 968 reached voice mail but did not say for what company.

Caller: Just said customer service no company name

Asked if I had a morgage or investment property
Said works for a few companies

Caller: 0414 088 968

Certain service companies will ring phone numbers to confirm if the number is active. If you answer it will hangup as it has already achieved its purpose. No point calling back goes to an automated server.

Tried to call back 0414 088 968 and just gets disconnected

I called back number 0414 088 968 rang once then gets disconnected automatically.